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Y cable allows you to control the iPod via the steering wheel buttons. I picked up an OEM Y cable on eBay for <$20. No reason to pay dealership prices on those things.
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2008 E90 335i // Black Everything // photos
COBB tuned / QTP e-cutouts / Helix FMIC / cp-e DCI / AWE BOVs / Catless / FBO + F15 X5 xDrive35i
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